Means for preventing undue tension in multicolor perfecting printing presses



. 1,614,177 11 1927' H. M. BARBER MEANS FOR PREVENTING UNDUE TENSION IN MULTICOLOR PERFECTING PRINTING PRESSES Filed April 19 1926 INVENTOR M ATTORNEYS Patented Jan. 11, 1927.

UNITED'STATES PATENT OFF-ICE.

HOWARD 1VL- BARBER,

SONS COMPANY, OF

MEANS FOR PREVENTING UNDUE TENSION IN MULTICOLOR PERFECTING PRINTING IRESSES.

Application filed April 19, 1926. Serial No. 103,023.

In multi-colo-r web perfecting printing presses where the plate and impression cylinders of the second printing unit are the same diameters as the plate cylinders of the first printing unit and the impression cylinder of the first printing unit is twice or any other multiple of the diameter of the 1mpression cylinder of the second printing unit, it has been very difficult to so feed the web to the second printing unit as to prevent undue strain on the web.

To cause the second printing unit to run in unison with the first printing unit so that the web will be fed properly to the second printin unit, to prevent undue'strain on a v a the web, I have found that it IS necessary to make the bearer diameters of the plate and impression cylinders of the second printing unit a predetermined amount less than their aliquot part of the bearer diameter of the impression cylinder of the first printing unit.

For example: In a machine where the impression cylinder of the second pr nting unit is approximately one-half the diametenof the impression cylinder of the first printing unit, the bearer diameters of the impression and plate cylinders of the second printing unit must be made slightly smaller than onehalf the bearer diameter of the impression cylinder of the first printing unit to eliminate any tendency to produce an undue strain on the web between the two printing units.

A practical embodiment of my invention is represented in the accompanymg drawing which discloses in diagram a multi-color web perfecting rotary printing press arranged to print four colors on the first side of the web and then two colors upon the other side of the web.

The four plate cylinders of the first printing unit are denoted by 1, 2, 3, 4 and their common impression cylinder by The two slate cylinders of the second prlnting unit are denoted by 6, 7 and their common impression cylinder by 8. The impression cylinder 5 of the first printing unit is shown as being twice the diameter of the impression cylinder 8 of the second printing unit. The web which is led in the usual manner through the first and second printing units, is denoted by 9. In this case the bearer diameters of the plate and impression cylinders 6, 7 and 8 of the second-printing unit should be slightly less than one-half the bearer diameter of the impression cylinder 5 of the first printingunit, to prevent undue strain on the web.

lVhat I claim is 1. In a multi-color web per 'ecting printing press, two printing units in which the diameter of the impression cylinder, of the second printing unit is an aliquot part'o't the diameter of the impression cylinder of the first printing unit, the bearer diameters of the plate and impression cylinders of the second printing unit being a predetermined amount less than their aliquot part of the bearer diameter of the impression cylinder of the first printing unit, whereby the second printing unit is caused to run in unison with the first printing unit to prevent undue strain on the web between the printing units.

2. In a multi-color web perfecting printing press, two printing units in which the diameter of the impression cylinder of the second printing unit is one-half the diameter of the impression cylinder of the first printing unit; the bearer diameters of the plate and impression cylinders of the second printing unit being a predetermined amount 0F PAWCATUCK, CONNECTICUT, ASSIGNOR TO C. B. COTTRELL & WESTERLY, RHODE ISLAND, A CORPORATION OF DELAWARE.

less than one-half the bearer diameter of the impression cylinder of the first printing unit, whereby the second printing unit is caused to run in unison with the first printing unit to prevent undue strain on the web between the printing units. i

In testimony, that I claim the foregoing as my invention, I have signed my name this 29th day of March, A. D. 1926.

' HOWARD M. BARBER. 

